/Engine/Source/Runtime/Landscape/Classes/LandscapeProxy.h
Samples an array of values from a Texture Render Target 2D. Only works in the editor
static [TArray](API\Runtime\Core\Containers\TArray)< [FLinearColor](API\Runtime\Core\Math\FLinearColor) > SampleRTData ( [UTextureRenderTarget2D](API\Runtime\Engine\Engine\UTextureRenderTarget2D) * InRenderTarget, [FLinearColor](API\Runtime\Core\Math\FLinearColor) InRect )